http://www.coldhardfootballfacts.com....php?Page=1017 (Paragraph below clipped from the link above)
They have set Vick free to run and have re-emphasized his rushing skills by using the shotgun formation as a run-first set (10 times in 13 plays in last week's 14-3 win over the Bucs).
There is a term for that type of offense among football historians, and that term is “single wing.” Alex Gibbs’s chop-block techniques may remind old timers of the days of the wing-T, if not the single wing. But remember, the Falcons have gained those yards against the defenses of Tampa Bay and Carolina, neither of which has proven particularly effective in this short season.